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【简答题】
如图所示，两列波长为λ的相干波在P点相遇，波在点S 1 振动的是φ 1 ，点S 1 到P点的距离是r 1 ；波在点S 2 振动的是φ 2 ，点S 2 到P点的距离是r 2 。以k代表零或正、负整数，则P点是干涉极大的条件是什么?
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反馈参考答案：
举一反三
【单选题】What do the hero’s initials “J.B.” represent for in Spellbound?
A.
John Brown
B.
Jack Black
C.
John Ballantyne
D.
Jack Ballantyne
【单选题】What do the hero’s initials “J.B.” represent for?
A.
John Brown
B.
Jack Black
C.
John Ballantyne
D.
Jack Ballantyne
【单选题】The hero “J.B.” would become upset when heis seeing _____________
A.
white clothe
B.
bright colour
C.
flower patterns
D.
parallel lines
【简答题】对不起，我没听_____，请再说一遍。
【单选题】In Spellbound, the reason why the hero “J.B.” has a guilt complex is because that___________.
A.
he has murdered one of his friends when he is a child
B.
he has witnessed a murder when he is a child
C.
he has accidentally knocked his brother onto sharp pointed railings, killing him
D.
he has accidentally knocked his brother off the cliff while they were
【单选题】The hero “J.B.” in Spellbound would become upset when heis seeing _____________
A.
white clothe
B.
bright colour
C.
flower patterns
D.
parallel lines
【简答题】对不起,我没有注意听。
【单选题】对不起,我没听清
A.
I beg you pardon?
B.
What is the English for?
C.
I am sorry I can't catch you
D.
Sorry!
【单选题】The reason why the hero “J.B.” has a guilt complex is because that___________.
A.
he has murdered one of his friends when he is a child
B.
he has witnessed a murder when he is a child
C.
he has accidentally knocked his brother onto sharp pointed railings, killing him
D.
he has accidentally knocked his brother off the cliff while they were skiing
【简答题】对不起,我没有注意听。
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